I would say the rifle with basic synthetic furniture, threaded barrel, railed receiver and two mags would be more than enough! I think my original CZ came with a cleaning kit, mag pouch and sheathed bayo that would only be useful if it was put on display. Otherwise all the extras just sit around and collect dust.
Having sufficient secondary market supply would be a big hit too. If you can get items like extended mag release, ambi safety, mags, brakes, CZ 958 "special" bayo stocks and handguards right off the bat would be a huge bonus too. In a perfect world though...